Improvement in dental tools



H. E. DENNETT- Dental Tools.

910,150,943, Patented May19,1874.

UNITED STATES" CEEIGE.

HERBERT E. DENNETT, OF BOSTON, MASSACHUSETTS.

lMPRVEMENT iN DENTAL TOOLS.

Specification forming part of Letters Patent No. l50,93, dated May 19, 1874; application filed January 27, 1874.

To all 'whom t may concern:

Be it known thatI, HERBERT E. BENNETT, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Dentists Tools; and I do hereby declare the following1 to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

The object of this invention is to furnish to dentists an improved instrument of the class technically called pluggers, which are used for the purpose of inserting and solidifying the foil inserted into the cavities of decayed ,teeth during the operation of llng; and it consists in a peculiarly-formed revolving cylinder of hardened steel, provided With serrations or teeth about its periphery, and attached to a suitable handle.

In the accompanying drawings similar letters of reference indicate corresponding parts in the different figures.

Figure lis a lrepresentation of the instrument complete. Fig. 2 is an enlarged view of the serrated cylinder. Fig. 3 is an enlarged section of the cylinder and the end of the handle to which it is attached, and Fig. 4 is an enlarged view of the cylinder with a portion of the handle attached.

In instruments of this class a difficult-y has been. encountered, from the fact that When one having the common rounded and smooth extremity Was used, it would pack and burnish the first layer of foil inserted-so as to prevent the next one from adhering to it. This has been partially remedied by the use of instruments having triangular grooves cut in their Working faces; but the desired end was not fully accomplished by this device, as

it was found that, although the surface of the it would rise to ill the intervening space,

thus leaving the whole filling in a spongy condition.

The instrument under consideration, which I Will now proceed to describe,has been shown by experience to obviate these diiiculties, leaving the Whole mass of lling in a perfectly solid condition, and ready for the iinal burnishing.

A is the handle, provided at one end with the tapering part B, having a curved portion, O, and at its extreme end provided with a rotating serrated cylinder, D. The handle and tapering portions of the instrument may be formed by forging from a single piece of steel, and this method of construction I prefer; but they may be made in separate pieces and attached to each other by any of the Wellknoivn methods of accomplishing that object.

The cylinder D is formed with a groove, a, which divides its periphery into two parts. These are serrated by cutting small triangular grooves parallel with its axis, and adjoining each other completely around it.. The cylinder is also perforated with a central opening for the reception of the shank b, which is bent at a right angle to the parte, and upon which it is secured and revolves.

In operation this cylinder is found to be continually in motion, rolling over the foil and pressing it into a compact mass, which fills the Whole cavity completely.

Having thus described my invention, I claim and desire to secure by Letters Patentrllhe combination, in a dental tool for consolidating filling, of a bent arm, with the revolvin g, grooved, or serrated cylinder of hardcned steel, all as and for the purpose specified.

In testimony that I claim the foregoing I have hereunto set my hand.

HERBERT E. DENN ETT.

Witn esses :Y

J. T. KENNERK, LW. Oscoop. 

